What is the most common cause of electric motor burnouts?

The concept of overheating as the most common cause of electric motor burnouts relates to the fact that electric motors generate heat during operation. If the heat is not adequately dissipated, it can lead to excessive temperature within the motor, ultimately damaging the insulation of the windings and resulting in a burnout.

Overheating can occur for several reasons, such as prolonged operation under heavy load, inadequate ventilation, or a failure in the motor's cooling system. Since motors are designed to operate within a specific temperature range, exceeding this range can compromise their performance and longevity. Over time, the heat can break down the winding insulation, leading to short circuits between the windings and ultimately causing failure.

In this context, while short circuits, improper installation, and worn bearings can contribute to motor failures, none are as prevalent as overheating. Short circuits may lead to immediate failure, but improper installation mainly affects the alignment and operation of the motor. Worn bearings can cause excess friction and heat but are typically a byproduct of long-term use rather than the main cause. Therefore, overheating is generally recognized as the primary factor in the burnout of electric motors.